Yes, Wersi is really good, but expensive:

Wersi OAS-Preisliste 2007

By example the "cheapest" Wersi Abacus configuration with real drums and the new arranger software will cost you EUR 8.380. If we subtract 19% german VAT and convert to USD this amounts to USD 9400!

Kind regards,
Tommy
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Yamaha PSR-S770, Korg Krome 61